Near-Threshold Production of $\eta$-Mesons

Abstract

It is shown that the striking energy variation in the $p\, d \rightarrow \mbox{$^{\, 3}{\rm He}$}\, η$ cross section near threshold is probably due to a final state interaction associated with a large (complex) $η-\mbox{$^{3}{\rm He}$}$ scattering length. The consequences of this hypothesis are studied for the production of the meson in the $η-\mbox{$^{4}{\rm He}$}$ and $η-\mbox{$^{7}{\rm Be}$}$ channels.

9 pages + 2 postscript figures

Cited by in corpus (77)

• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Photoproduction of eta-mesic 3He
• Precision study of the eta-3He system using the d+p->3He+eta reaction
• pi N --> eta N and eta N --> eta N partial wave T-matrices in a coupled, three channel model
• Measurement of the dp -->3He eta reaction near threshold
• Close-to-threshold Meson Production in Hadronic Interactions
• Eta-Helium Quasi-Bound States
• Coherent photoproduction of eta-mesons off 3He - search for eta-mesic nuclei
• The Eta-Nucleon Scattering Length and Effective Range
• Is there an eta-3He quasi--bound state ?
• eta-Nucleon Scattering Length and Effective Range uncertainties
• Are there eta-Helium bound states?
• Interaction of eta mesons with nuclei
• Dependence of calculated binding energies and widths of $\eta$-mesic nuclei on treatment of subthreshold $\eta$-nucleon interaction
• Photoproduction of mesons off nuclei
• Near threshold eta production in proton-proton collisions
• Near threshold eta meson production in the d+d->alpha+eta reaction
• Low-energy etaN interactions: scattering lengths and resonance parameters
• Meson-baryon scattering lengths in HB$\chi$PT
• Eta-N Final State Interaction in incoherent Photoproduction of Eta-mesons from the Deuteron near Threshold
• Measurement of p + d -> 3He + eta in S(11) Resonance
• Level crossing of particle-hole and mesonic modes in eta mesic nuclei
• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• Cross Section and Tensor Analysing Power of the $\vec{d}d\to \eta \alpha$ Reaction Near Threshold
• Precision study of the d+p->3He+eta reaction for excess energies between 20 and 60 MeV
• $\eta$-Deuteron Scattering
• Eta and eta-prime meson production in the reaction pn -> dM near threshold
• Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction
• Search for Quasi Bound $\eta$ Mesons
• Faddeev-type calculation of eta-d threshold scattering
• Eta-mesic nuclei: past, present, future
• A Covariant OBE Model for $\eta$ Production in NN Collisions
• The $\eta$-3N problem with separable interactions
• Bounds on the bound η^3He system
• Low-energy scattering and photoproduction of $\eta$-mesons on three-body nuclei
• Threshold scattering of the eta-meson off light nuclei
• Photoproduction of mesons from nuclei - In-medium properties of hadrons
• Final state interactions in the eta-d system
• Search for He-eta bound states with the WASA-at-COSY facility
• Constraining the optical potential in the search for eta-mesic 4He
• eta N S-wave scattering length in a three coupled channel, multiresonance, unitary model
• $\eta$-meson in nuclear matter
• The $\eta {-}^3$He scattering length revisited
• Solution of the eta-4He problem with quasi-particle formalism
• Coherent π0η photoproduction on s-shell nuclei
• Quasifree Eta Photoproduction from Nuclei
• Three-body mechanism of $\eta$ production
• Interference and nuclear medium effects on the eta-mesic nuclear spectrum
• The energy dependence of the in-medium $\eta N$ cross section evaluated from $\eta$-photoproduction
• The $pd{\to }^3{H}_{\Lambda }{K}^{+}$ reaction cross section
• Invariant mass distributions for the pp to p p eta reaction at Q=10 MeV
• Few-body aspects of the near threshold pseudoscalar meson production
• Total and differential cross sections of $\eta$-production in proton-deuteron fusion for excess energies between $Q_{\eta }=13\text{MeV}$ and $Q_{\eta }=81\text{MeV}$
• Study of the 3He-eta system in d-p collisions
• On eta-pi mixing close to the eta-Helium threshold
• The dd -> 4He eta Reaction Near Threshold
• Eta-nuclear interaction: optical vs. coupled channels
• Status and Perspectives of the Search for Eta-Mesic Nuclei
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Charge symmetry breaking as a probe for the real part of eta--nucleus scattering lengths
• eta-^4He Bound States in the Skyrme Model
• Relativistic description of the np to eta d reaction near threshold
• Binding vs. scattering length: $\eta$ in light nuclei
• Systematic few-body analysis of eta-d, eta-3He and eta-4He interaction at low energies
• Spin observables of the reaction pd-3He eta and quasi-bound 3He-eta pole
• Search for the eta-mesic Helium bound state with the WASA-at-COSY facility
• The detailed mechanism of the eta production in pp scattering up to the Tlab = 4.5 GeV
• The importance of the nucleon-nucleon correlations for the eta alpha S-wave scattering length, and the pi-eta mixing angle in the low-energy eta alpha scattering length model
• Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states
• The pd --> ^3He eta pi0 reaction at T_p = 1450 MeV
• Study of the eta meson production with polarized proton beam
• $\eta$ bound state: theory and experiment
• Backward single-pion production in the $\mathbf{pd}\to {}^3\text{He}{\mathbf{\pi }}^0$ reaction with WASA-at-COSY
• Hadronic production of eta--mesons: recent results and open questions
• Total and differential cross sections of the $\mathbf{dp}\to {}^3\text{He}\mathbf{\eta }$ reaction at excess energies between 1 and 15 MeV
• Production and interaction of the eta meson with nucleons and nuclei
• Production of eta and 3pi mesons in the pd->3HeX reaction at 1360 and 1450 MeV